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Finally, we've come full circle. The popular notion of cloud computing really began with Google: A sea of cheap white Google servers shimmered before the eyes of C-level execs everywhere, igniting the dream of commodity computing. Pool everything! Allocate resources wherever you need them! No waste! No downtime!

IT managers stared in horror as they were asked the unintentionally hilarious question, "How can we be like Google?" Anyone, it seemed, could move from the crippling complexity of the average data center to elegant yet economical simplicity in one swift imaginary maneuver.

Now, some four years after Google launched its App Engine development platform, Google has finally decided to get in the public cloud IaaS game -- currently dominated by Amazon -- and rent part of its infrastructure in the form of Google Compute Engine. The announcement comes at a time when customers have grown more sophisticated about cloud computing, with a better understanding of how hard and expensive it is to build your own cloud and of the limitations of outsourcing workloads to IaaS providers.

Where will Google Compute Engine fit in the IaaS mix? It's hard to tell, given the lack of detail in the announcement. Last week I had a brief conversation with the product manager for Google Compute Engine, Craig McLuckie, who seemed utterly confident that the sterling reputation of Google's world-class infrastructure would bring out customers in droves.

It has taken us a little while to get this product to market, and the heart of that has been around the core technology. Our target here is not to deliver just another multitenanted cloud. Our goal is to provide our customers infrastructure in a way that feels familiar to them, like their own data center. It's about predictability of performance; it's about having access to clean infrastructure. So it's taken us awhile to produce a solution that we're proud of and that we think compares favorably not only to other multitenanted clouds, but to on-premise data centers.

Note the line about "predictability of performance." That's a slap at Amazon Web Services, which has earned a reputation for being a little erratic in that department. How can Google deliver on its promise? Basically, McLuckie said, because Google's infrastructure is better.

Last week in an interview with InfoWorld, Michael Crandell, CEO and founder of RightScale, provided some insight into the nature of that infrastructure, citing among other things the high-speed network that spans Google's global data center locations. But with the launch of Compute Engine, Google is clearly trading on its own brand and the excitement its advanced infrastructure stirred years ago.

Back to my original question: What took Google so long? McLuckie's "no wine before its time" explanation seemed a little off. For one thing, Compute Engine is not yet available even in beta, but in "limited preview." If Google infrastructure as it stands is so great, what required all that time to be carefully crafted? It could only be the software that will deliver the compute cloud to customers -- and perhaps the service and support, which has not been a Google strong suit for, say, the paid version of Google Apps.